Genetic structure of Daphnia galeata populations in Eastern China.
Genetic structure of Daphnia galeata populations in Eastern China.
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中国东部地区水蚤种群的遗传结构。
DOI：
10.1371/journal.pone.0120168
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发表时间：
2015
期刊：
影响因子：
3.7
通讯作者：
Yin M
中科院分区：
文献类型：
--
作者：
Wei W;Gießler S;Wolinska J;Ma X;Yang Z;Hu W;Yin M
本研究首次对中国东部地区长鳍水蚤复合种群的遗传结构进行了研究。在所调查的八个湖泊中，只有一个物种，即D.galeata；通过在15个微卫星座位上的等位基因变异进行分类鉴定。根据所应用的统计分析的类型，出现了三个遗传差异较大的半乳木亚群。因此，贝叶斯聚类、基于因子对应分析结果的判别分析和UPGMA聚类一致地表明，来自两个相邻湖泊的种群在遗传上与其他湖泊中发现的混合基因类型相分离，这形成了另外两个亚组。各种群的克隆多样性均较高，大部分样品均未偏离Hardy-Weinberg平衡，说明克隆选择对遗传多样性影响不大。总体而言，人口没有按地理来源聚集。进一步的研究将表明，观察到的模式是否可以通过自然殖民过程或最近对主要是人工湖的人为影响来解释。
This study presents the first examination of the genetic structure of Daphnia longispina complex populations in Eastern China. Only one species, D. galeata, was present across the eight investigated lakes; as identified by taxon assignment using allelic variation at 15 microsatellite loci. Three genetically differentiated D. galeata subgroups emerged independent of the type of statistical analysis applied. Thus, Bayesian clustering, discriminant analysis based on results from factorial correspondence analysis, and UPGMA clustering consistently showed that populations from two neighbouring lakes were genetically separated from a mixture of genotypes found in other lakes, which formed another two subgroups. Clonal diversity was high in all D. galeata populations, and most samples showed no deviation from Hardy-Weinberg equilibrium, indicating that clonal selection had little effect on the genetic diversity. Overall, populations did not cluster by geographical origin. Further studies will show if the observed pattern can be explained by natural colonization processes or by recent anthropogenic impact on predominantly artificial lakes.